Or, just because you CAN do it. I first saw it in a video by Bexar Prepper here, and she canned it in wide mouth quart jars. Then I watched her try to remove the meat loaf from those jars and, because of the shoulder on the jar, it had to come out in chunks. I suppose that's alright, but I wanted mine to come out cleanly so I could slice it and heat it for the dinner plate or sandwiches. So I do mine in wide mouth pints or the straight sided 3 cup jars designed for asparagus.
Keep the top of the mixture no higher than where the threads start on the jar, about 3/4 of an inch. Clean the rim of the jar with white vinegar to remove any residue from packing the jar. The rim has to be clean.
Use the pressure and time guides for beef (75 min. for pints, 90 min for qts at 10 lbs) and let the canner cool on its own (takes 20 min) before removing the jars, which will still be bubbling. A couple of hints when you are processing raw ground beef: use the leanest ground beef you can get to minimize the grease, which will still be present but to a minimum AND when the jars cool and seal and you remove the rings to wash the jars, they are going to be slimy because some of the fat has cooked out. Take care and use plenty of very warm sudsy water to wash the thread area and jar.
In these photos, I did not use lean ground beef but will scrape the grease away when I slide the meat loaf out of the jar. Yes, it looks a little like Alpo when you take it out, but tastes a WHOLE lot better! Just heat and serve. People will call you crazy until they try some.
It's always ideal to store canned foods in a cool, reasonably dry place.